It is an unusual way of working but if you are happy with it simply ask him to raise his monthly contribution to £200.
The OP's financial arrangements have obviously worked for them for many many years, and with respect, she didn't ask for the rest of us to tell he how their own arrangements work, or to be castigated for not having a similar set-up.
The issue, as presented, is that her husband isn't paying for the wine he's asking her to buy, after promising that he would pay. In those circumstances, I think I would probably ask him why he's stopped paying or just stop getting the wine, and tell him why when he asks why it isn't there. Either way, there would be a discussion about it, and if the OP wanted to bring up the apparent inequality of their financial arrangements she could do it then, or if she is happy with things as they are (which is up to her) she can limit the discussion to the wine.